Drafting device



March 3l, 1953 o. KLABUNDE DRAFTING DEVICE 2 SHEETS-SHEET l Fil'e d Feb.24, 1951 March 31, 1953 o. KLABUNDE 2,632,975

` DRAFTING DEVICE Filed Feb. 24, 1951 2 SHEETS- SHEET 2 IN V EN TOR.

dif@ Zwama@ Patented Mar. 31, 1953 UNITED STATES ATENT OFFICE 4 Claims.

The present invention relates to drafting devices, and has for its mainobject the provision of a board for receiving in an encompassingrelation an endless drawing paper.

A further object of the present invention is the provision of means in adrawing board whereby an endless paper sheet may .be held ina tautrelation with a board. Another object of the present invention is theprovision in association with one edge of a drawing `board of a rollerheld under a yielding tension to or away from the board, so that when anendless sheet of paper is passed around the board and over the saidroller, the latter, normally under :a pressure away from the board, maymaintain the sheet in a stretched relation with the board, said rollerbeing capable of manual depression towards the board for the purpose ofslackening the endless paper sheet so that the latter may -be shiftedaround Ithe board.

Another object of the present invention is the Vprovision of a suitablemechanical means Whereby the endless paper sheet may be shifted aroundthe board.

A still `further object of the present invention is the provision of asuitable removable guard at one edge of the board for guarding anendless paper sheet therearound against scratching or soiling.

With the Iabove general objects in view land others that will appear asthe invention is better understood, the same consists in the novel`construction, combination and arrangement of parts hereinafter morefully described, illustrated in the accompanying drawings and pointedout in the appended claims.

In the drawings forming a part of this applica- 'tion and in which likedesignating characters referto corresponding parts throughout theseveral views: l Fig. l is a top elevational View, partly in section,with' an endless paper sheet in an operative position therewith; Y

Fig. 2 is an end elevation-al View of the board,

along thefront or near edge thereof; L Fig. 3 is a side elevational Viewof the board,

on a reduced scale;

Fig. 4 is an end elevational view of the board, partly in section,`along the rear or far edge thereof;

Fig. 5 is a near end elevational view of the board, with a mechanismcooperating with that end for shifting the endlessl paper sheet aroundthe board; A

' Fig, 6-is a side elevational view of the board, in-

l not extend across wings I 2.

cluding the end view of the mechanism shown in Fig. 5 for mechanicallyshifting the paper sheet around the board; and

Fig. '7 is a transverse cross sectional view through the mechanism formechanically shifting an endless paper sheet around the board, with across section of 1a guard overlying the paper sheet adjacent the frontend of the board.

Referring to the present drawing in detail there is shown therein boardIB, adapted to receive in an encompassing relation an endless sheet ofpaper II. Said paper sheet II is narrower than the width of board IB, sothat the side edges of board I0 extend beyond the side disposed upon oneface of each cleat I3, While anequal number thereof is disposed adjacentthe opposite face of each cleat I3. The lower ends of said clampingmembers I4 enter longitudinai recesses I6 along each face of cleat I3.By virtue of nthis arrangement cleats I3 may be shifted ilather towardsthe front or the rear end of board Aifixed to the front or near end ofboard I0, including Wings I2, by means of screws I'I, is an edge pieceI8, segmental on a transverse cross section, with its arcuate facedisposed outwardly.

lWhile the upper edge of sai-d edge piece I8 remains flush with theupper face of board I0, including wings I2, the lower edge thereofremains in a spaced relation with the lower face of the board and wingsI2, as is clearly seen in Fig. 3, for the purpose hereinafter specied.

Adjacent the rear or farther end of board Il) roller I9 is positioned ina spaced relation with board Ili. Said roller I9 may be slightly longerthan the width of paper sheet II. Its ends do The upper edge of saidroller I 9 remains on the upper plane of board I 0, while thediametrically opposite portion of the rollers periphery extends belowthe lower plane of said board I0. By virtue of this arrangement saidroller I9, in cooperation with the downwardly extending edge of edgepiece I8 maintains the lower portion of paper sheet II in a spacedrelation with the lower face olf board I0, while the upper portion ofthe endless paper sheet remains in contact with the upper face of saidboard I0, as is clearly seen in Fig. 3. It is of course only the upperportion of the endless lpaper sheet which remains in contact with boardI0, which is to receive sketching or drawing impressions.

Each of the ends of roller I9 carries shaft 20 in a concentric relationwith the said roller. The inner end of said shaft 26 may be threadedwhereby said shaft may be driven into the roller. Integrally formed witheach shaft 20 is collar 2|, which is in a spaced relation with the outertermination of said shaft 29. Loosely positioned upon shaft 26 is wheelor bearing 22, for which collar 2| acts as a stop from one outer facethereof. Loosely positioned upon said shaft 20 and interposed betweenthe end of roller I9, and the adjacent inner face of wheel 22 is anannular spacer 23. By virtue of this arrangement wheel 22 i's capable ofrotary movement around shaft 2l), but is incapable of longitudinalshifting movement lin relation therewith.

Aixed by means of screws 29 to the rear end o f each wing I2 is plate25. Either integrally formed with said plate 25, or rigidly aflixedthereto, either by soldering or otherwise, is leaf spring 26, of agenerally U-shaped formation, the bight of which extends downwardly andbeyond the lower face of'board I9 and wings I2, as is best seen in Fig.6. The opposite end of said spring 26 terminates in an inwardly woundcoil 21,

which encompasses and rigidly engages wheel 22. l

`From the hereinabove description it will be noted that roller I9 issupported and held in an operative position with relation to board I0only by means of a pair of springs 26, one coacting with each end ofsaid roller I9. Normally, said springs 26 tend to urge said roller I9away from the adjacent end, that is rear or far end, of board I0, forthe purpose of maintaining the endless paper sheet in -a stretched andtaut condition with relation to board I0, when said paper sheet ispassed over said edge piece |8and said roller I9. n

' The parts already described render the invention essentiallyoperative. To make endless paper sheet II, a longitudinal strip of paperis passed over edge piece I8 and roller I9, and thereupon the ends of apaper strip are joined by a Scotch tape or any other means. Before theends of the paper strip are joined it is advisable to manually depressroller I9 toward board I9, against the tension of springs 26, in orderto eliminate any slack in the endless paper sheet which is ultimately tobe formed. When the ends of a paper Strip have been joined, the manualpressure against roller I9 is eliminated, and springs 26, tending topress away Vfrom board I9, exert pressure upon the formed endlesspapersheet in order to maintain the latter in a stretched and tautcondition with relation to board I0.

Rather than to use manual operation for 'depressing roller I9 for thepurpose describedin the last preceding paragraph, suitable mechanicalmeans is Aprovided for the purposejof main,- taining roller I9 shiftedtowards the adjacent end of board I9 while a paperendless sheet is beingprepared around the drawing board. That means includes arm 28, hingedlyconnected t-'o each plate 25 at lugs 29 extending from `each of saidplates 25. The opposite free end of each arm 2 8 is provided withopening 30. When, said Varms 28 are Vraised into a vertical 'position'with relation to plates 25, the free ends of shafts 20 are not inalinement with openings 30, but are farther removed therefrom towardsthe ends of arms 28, due to the action of springs 26. When howeverroller I9 is manually pressed towards the adjacent end of board IU thefree ends of shafts 20 will eventually come into an alinement withopenings 36, provided that arms 28 are held substantially in a verticalposition` with relation to plates 2.5. When thev free ends of saidshafts 20 come in alinement with 'said openings 30 arms 28 are thenswung towards said shafts 20, until the shafts enter said openings 30,the position indicated by dotted lines in Fig. l. When in that positionshafts 20 and through them roller` I9V 'are effectively locked to saidarms 28, rendering springs '26A inoperative, thereby bringing about aposition of roller I9 which is rigid relative to board I0. When, in thatposition of roller I9 with relation to board I0, a strip of paper 1spassed over edge piece I8 and said roller I9, and the ends of the paperstrip are joined for effecting an endless paper sheet II around boardI0, as is clearly seen in Figs. l, 3 and 6. It is noted that the papersheet formed around the 'board by the operation last hereinabovedescribed is reasonably stretched andtaut with relation to board I0,edge piece I8 and roller I9. 'When however arms 28 are swung into theirinoperative position, that is away from their engagement with shafts 26,the full lines position illustrated in Fig. l, roller |9 is then free toshift laway from the adjacent endof board Illdue to the actions ofsprings 26, thereby removing any slack that might have existed in theendless paper sheet after it was formed around board I0.

Manual depression of vroller I9, as well as the pressure exertedthereagairist by the endless paper sheet II, may eventually cause saidroller I9 to assume a bent formation. To guard against this suitablemechanism is provided whereby the roller may be pressed at all timesaway from the adjacent end of boardv I6. This means, best shown in Fig.1, includes cylindrical tube 3| fric.- tionally held within'bore 32.made within Ytheend of board IU, which is adjacent to roller I9,Cylinidrical hollow Yplunger 3,3 is positioned within tube 3| forlongitudinal movement therewithin. Tube 3| is provided with an inwardlyextending indent 34 which enters key-way. 35v madefupon the periphery ofplunger 33in alongitudinal direction, said key-way being open upon. theinner end of said plunger r 33. By virtueV of this arrangement plunger.33 may readily be inserted within tube 3| with indent 34r made to enterkey-way 35. It is clear that indent, 34, permits longitudinal shiftingmoi/ement` of plungerr 33 within tube 3 I, but prevents rotarymovementof said plunger 33 within said tube 3|. Coil spring 36 isextended within the cavity of p1unger33. to bear against thebottom Ofbore 32 in order to, normallytend to shift said plungerV 33 out of tube3|. Integrally formed with saidfplunger sa is an enlarged heauai, saidboren at its outer end being, enlarged` in order to acc-ommodatetherewithin said head 3.1. The enlarged portion of bore 32 affectsshoulder-38, with which the adjacent end of tube` 3| terminates, andwhich forms -a stopfor head 31, preventingv its further inward shifting.At the outer end head 31 carries wheel 39, journalleduponp'in 'for'rotary movement.

Coil spring 36 urges wheel v'39.in ycontact with roller 9 an d exertspressure thereon tending'to urge saar-011er 'fs away 'from the-iadjaceritena of board I0. By virtue of this arrangement deformation ofroller I9 is prevented which other- Iwise might ensue due to repeatedmanual shifting of roller I9 toward board IIJ, as well as due totheconstant pressure thereagainst by the endless paper sheet II. Ifroller I9 is unduly long the same may require a plurality of thecounter-pressure devices including plunger 53, head 31 and wheel 39.

It is further observed that due to the fact that wheels 22 are looselypositioned upon shafts 20, roller I9 is capable of rotary movementwithout interference from said wheels 22 or springs 26. As the drawingupon the endless paper sheet II progresses from the rear or far end ofboard Il] toward the near or front end thereof, the endless paper sheetmay readily be shifted around the board by merely exerting pressure byfingers upon the upper portion of the paper sheet and shifting the papersheet upon the upper face of board I0. This operation will of courseshift the endless paper sheet II around said board I as well as oversaid edge piece I8 and roller I9.

If however the paper sheet is unduly long it may then be desirable toshift the paper sheet around the board by mechanical means. Such means,best illustrated in Figs. 5, 6 and 7, includes arcuate channelled strip4I, positioned forwardly of the front edge of board I0. Said strip 4Ihas an integrally formed extension 42, projecting from the lower edgethereof. Said extension 42 overlies the lower face of board Ill,adjacent its front end, and is there afxed by means of screws 43. It isunderstood that strip 4I and extension 42 may be made in a plurality ofpieces spaced lengthwise of roller 44.

Roller 44 is positioned within the cradle of said strip 4I, for a freerotary movement therewithin. Said roller 44 is mounted upon shafts 45,which are in a rigid, concentric relation with said roller 44. Eachshaft 45 is freely journalled within bearing llili, which is integrallyformed with and extending from plate 41. Each plate 41 is affixed, bymeans of screws 48 to the front end of each wing I2. Integrally formedwith each shaft 45 is a spacing collar 49 which is normally interposedbetween the adjacent bearing 45 and the end of roller 44. By this meansroller 44 is prevented from longitudinal shifting movement.

One shaft 45 is extended slightly beyond the outer side face of one wingI2 and is provided with a longitudinal keyway 50, within the outer endof which a comparatively short key 5I is inserted and there rigidlyheld. Freely rotatable upon the portion of that shaft 45, which remainsbetween said key 5I and bearing 46, is collar 52, with the outer end ofwhich crank 53 is integrally formed and radially projects therefrom.Handle 54 connects with the opposite end of said crank 53.

Collar 52 on its inner periphery is provided with a plurality ofradially extending slots 55, as is seen in Fig. 6. When said collar 52remains shift-ed towards the adjacent bearing 46, the same remains outof engagement with key 5 I because the latter does not extend within anyone of slots 55. In that position crank handle 53-54 remains inoperativeand roller 44 may rotatably shift with both of its shafts 45, without inany manner aifecting collar 52 or its crank handle. The latter simplyhangs down, as seen in Fig. 5.

Thus, endless paper sheet I I may be manually shifted upon board III andaround and with rollers I9 and 44 Without aiecting collar 52 and itscrank handle.

When however it is desirable to use the crank handle, collar 52 islongitudinally shifted away from bearing 46, with key 5I entering one ofsaid slots 55, until crank 53 is well past the plane co-extensive withthe side face of the adjacent wing I2. This will permit turning of thecrank handle without interference from wing I2. This in turn will imparta rotary shifting movement to shaft 45 which carries said collar 52, andthis in turn will cause rotatable shifting movement of rollei 44. Therotation of roller 44 will necessarily cause the shifting movement ofthe endless paper sheet II`.

The portion of the endless paper sheet II stretched over either saidedge piece I8 or roller 44, as the case may be, may become soiled orscratched when in contact with a draftsmans 'hands or clothing,particularly when the endless paper sheet II has been worked upon for acomparatively long time without frequent shifting. To guard againstsoiling or scratching of that portion of the endless paper sheet II, asuitable guard therefor is provided. The same includes an arcuate,trough-like member 56, which in its operative position overlies andremains in contact with the endless paper sheet II stretched over roller44 or edge piece I8, as the case may be, as is best seen in Fig. 7.Integrally formed with each end of said member 56 is substantial-lyU-shaped wall 51, each of which is adapted to frictionally grasp theadjacent bearing 46 in a clamping relation, as is seen in Fig. 6. Fromthis construction it will be readily seen that guard 56 easily snaps onand off from roller 44 or edge piece I8, as the case may be, and therebyeffectively shields the portion of the endless paper sheet Il overlyingsaid roller 44 or edge piece I8, as the case may be.

Only slight modification of said guard 56 in order to adapt the same foruse in connection with edge piece I8 need be had. All that is requiredis the elimination of walls 51 at the end of member 56, and making saidmember 56 resilient to snap on or off said edge piece I8.

It is to be understood that endless sheet of paper II may have under itan endless wing or apron which would of course shift with said endlesssheet of paper I I.

While there is described herein a preferred embodiment of the presentinvention, it is nevertheless to be understood that minor changes may bemade therein without departing from the spirit and scope of theinvention as claimed.

What I claim as new is:

1. A drafting device comprising a board, a roller adjacent one end ofsaid board, said board and said rollerl being adapted to receive anendless sheet of paper in an encompassing relation, a wheel journalledat each end of said roller, and a pair of leaf springs anchored by oneof their ends to said board, each of said springs by its opposite endengaging one of said wheels, normally said springs urging said rolleraway from said board for maintaining the endless sheet of paper in astretched condition.

2. A drafting device comprising a board, a roller co-acting with one endof said board, said board and said roller being adapted to receive anendless sheet of paper in an encompassing relation, means for normallyurging said roller away from said board for maintaining the endlesssheet of paper in a stretched condition, normally the endless sheet ofpaper exerting a force 7 uponA saidY roller` in the direction of said`board, and means in substantially anti-frictiorial` contact with theroller'. between the edgesof. said endless sheet resiliently. urgedthereaganstf for counteractingv said forcewhile permitting rota,- tionof said'roller.

3. A drafting devicel comprising a.l hoard,- a roller co-acting with oneend of saidzboard, said board and. said roller being,` adapted toreceive an endlesssheet of papery inan encompassing relation, means fornormally urging saidfroller awayfrom said board forimaintaining the-endelesssheet. of paperlin a .stretched conditions nerr really the endlesssheet' of. papery exerting pres: sure upon said roller in the; direc of;said board, anlmeans for-counter-actin eure, Said last namedmeansfineludine ins wheel meunied in saidbeardi, Seid e ,nf inse/.heelbeinepoeiiiened iniermediately ne .end

0f seid roller,A Seid tensioning; wheeLeQntae 'ne the peripheryrofsaidroHerin a transversevdirection for-urging-said roller away from,Saidboaifd,

4. A drafting device. comprising ay boar a roller cgi-acting- Wth: oneend of saidboard, said board and said roller beingVadapted-to receive anendlessw sheetof, paperr in an encompassing relation, tensioningartica-ns.- carriedy bysaid board and-connected with saidV roller'fornormally urgingthe latter awayffrom said board forV maintainingtheendless sheet of; paperin asstretched condition, and means forrendering-,said tensionngf means inoperative during application of theendless sheet o f'paper around, said board and Saidreliery said; lastnamed: means: including a pair of arms hingedly connectedto saidboard,said arms beingadapted toengagefsaid roller for aininsthefsame inarigidpesitionwith relation tosaid heard,

REFERENCES;

The: following references are-oi record-1in the file,V of 'this patent:

UNITED-` STATES PATENTS Number Name; Date 397,421 Henley K Y Feb. 5,1889 332,909 Homans Oct. 9, 1906 127,023,024- Sinclair Dec. 12, 19161,896,923 Tevonian Feb. 7, 1933 v215 2,603,908, Schwefel ,--s July 22,1952

